2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 197

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 197

4. Ignition OFF, disconnect the harness connector at the PPS module.

5. Ignition ON, test for infinite resistance between the passenger seat belt tension sensor signal circuit terminal C X2 and ground.

瀚慖f less than the specified value, test the signal circuit for a short to ground.

6. Ignition ON, test for less than 1 volt between the passenger seat belt tension sensor signal circuit terminal C X2 and ground.

瀚慖f greater than the specified range, test the circuit for a short to voltage

7. Test for less than 1 ohm between the PPS module signal circuit terminal 4(X88+HP2/Z88+HP2) or terminal 6 (-HP2/Z75+HP2) and the

passenger seat belt tension sensor terminal C X2.

瀚慖f greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the PPS module.

8. If all circuits test normal, replace the passenger seat belt buckle which includes the seat belt tension sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)

* Driver or Passenger Seat Belt Buckle Replacement (with HP2) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt

Buckle/Service and Repair/Driver or Passenger Seat Belt Buckle Replacement)Driver or Passenger Seat Belt Buckle Replacement (without

HP2) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt Buckle/Service and Repair/Driver or Passenger Seat Belt Buckle

Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for PPS replacement, setup, and programming

B0074

DTC B0074

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using the diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0074 03

- Passenger Occupant Classification Sensor Circuit Voltage Below Threshold

DTC B0074 07

- Passenger Occupant Classification Circuit Voltage Above Threshold

DTC B0074 08

- Passenger Occupant Classification Circuit Signal Invalid

Diagnostic Fault Information

Circuit/System Description

The passenger presence system (PPS) uses a silicone filled sensor pad located underneath the passenger seat foam cushion and is connected by a

hose clamp to a pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder

by the pressure sensor. The pressure sensor is a 3-wire sensor consisting of a power, ground, and signal circuit. The PPS continually monitors itself

and if a fault in this circuit occurs, a DTC will set. When the sensing and diagnostic module (SDM) detects this DTC within the PPS, it will notify

the customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will

communicate to the SDM through serial data communications that a PPS fault is present. The SDM will then suppress the deployment of the